Hydraulic action- The force of the water hitting the banks and bed.
Abrasion- When the load of the river is repeatedly hitting the bed and banks causing material to break off.
Attrition- When stones and boulders knock against eachother and cause bits to fall off so that they reduce in size.
Solution- Occurs when rivers flow on certain rock typs such as chalk and limestone, these are soluble in rainwater and are dissolved by the river.
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